Not the way you have written it because you have the parentheses wrong. The last "!" should not be the whole "n!/(n-2)" and 2 does not multiply 50. On the right, it is clearer if you write (2n)! rather than 2n! which can be interpreted as 2(n!). What you should have is
2(n!/(n-2)!+ 50= (2n!)/(2n-2)! or
[tex]2\frac{n!}{(n-2)!}+ 50= \frac{(2n)!}{(2n-2)!}[/tex]